41 lines
1.9 KiB
Ruby
41 lines
1.9 KiB
Ruby
#
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# Copyright (C) 2013 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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class AddDiscussionTopicMaterializedViewPk < ActiveRecord::Migration[4.2]
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tag :postdeploy
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disable_ddl_transaction!
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def self.up
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case connection.adapter_name
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when 'PostgreSQL'
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# by pre-scanning the table, it's all in memory and adding the NOT NULL column constraint becomes really fast
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DiscussionTopic::MaterializedView.count
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execute("ALTER TABLE #{DiscussionTopic::MaterializedView.quoted_table_name} ALTER discussion_topic_id SET NOT NULL")
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execute("ALTER TABLE #{DiscussionTopic::MaterializedView.quoted_table_name} ADD CONSTRAINT discussion_topic_materialized_views_pkey PRIMARY KEY USING INDEX index_discussion_topic_materialized_views")
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end
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end
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def self.down
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case connection.adapter_name
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when 'PostgreSQL'
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execute("ALTER TABLE #{DiscussionTopic::MaterializedView.quoted_table_name} DROP CONSTRAINT discussion_topic_materialized_views_pkey")
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execute("ALTER TABLE #{DiscussionTopic::MaterializedView.quoted_table_name} ALTER discussion_topic_id DROP NOT NULL")
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add_index :discussion_topic_materialized_views, :discussion_topic_id, :algorithm => :concurrently, :unique => true, :name => 'index_discussion_topic_materialized_views'
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end
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end
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end
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